It was found that a Certificate Authority (CA) issued a fraudulent
HTTPS certificate. This update renders any HTTPS certificates signed
by that CA as untrusted, except for a select few. The now untrusted
certificates that were issued before July 1, 2011 can be manually
re-enabled and used again at your own risk in Firefox; however,
affected certificates issued after this date cannot be re-enabled or
used. (BZ#734316)

All Firefox users should upgrade to these updated packages, which
contain a backported patch. After installing the update, Firefox must
be restarted for the changes to take effect.

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